Calorimeter
CWD SPC
CWD product series
The combustion calorimeters in the CWD product series (Calorimetry, Wobbe Index, Specific Gravity) are used to precisely determine the gas quality and all associated relevant measured variables:
Calorific value
Calorific value
Wobbe index
Specific density
CARI and air requirement
The CWD SPC (System Purge Certified) is a robust outdoor version of the CWD that has been specially developed for use in potentially explosive atmospheres. The device fulfills all requirements according to:
NFPA 496, 2013
ANSI / ISA 12.12.01
Classification: Class I, Division 2, Groups B, C, D, T4
Thanks to its certified system-purge concept, the CWD SPC is ideal for industrial applications where maximum safety and precise measured values are required under changing operating conditions.
Typical areas of application
The CWD SPC is used worldwide in demanding industrial processes, including for:
Monitoring and control of flare gases
Control of gas turbines
Fuel control in refineries
Process control in petrochemical plants
Thanks to its robust design, certified explosion protection version and high measuring accuracy, the device offers a reliable solution for safety-critical and dynamic gas applications.
| Parameter | Value |
|---|---|
| Weight | Up to approx. 250 kg |
| Dimensions (H × W × D) | 1150 × 2000 × 600 mm |
| Protection Rating | IP64 (NEMA 4X) |
| Ex Classification | Class I, Div. 2, Group B, C, D, T4 |
| Ambient Temperature | −20 °C to +45 °C |
| Ambient Humidity | 0–95% Relative Humidity |
| Ambient Pressure | 800–1100 hPa (0.8–1.1 bar) |
| Gas Inlet Pressure | 30–40 mbar |
| Process Gas Inlet | 1, additional optional |
| Test Gas Inlet | 1 per measuring range |
| Carrier Gas Inlet | Max. 1 |
| Relative Gas Humidity | ≤ 95%, non-condensing |
| Gas Inlet Temperature | Max. 45 °C |
| Instrument Air Consumption | 30 m³/h (standard conditions) |
| Instrument Air Pressure | Min. 5 bar, Max. 10 bar |
| Supply Voltage | 240 VAC, 50/60 Hz; 110 VAC, 60 Hz |
| Interfaces | 8× SPDT Relays, 3× 4–20 mA, additional optional, optional bus systems |
| T90 Response Time | < 15 s |
| Certifications / Compliance | NFPA 496: 2013; ANSI/ISA 12.12.01 |
| Junction Box Approval | IECEx PTB 09.0048; PTB ATEX 1108 |
The CWD product series in comparison
CWD BASIC
Reliable measurement of calorific
and heating value as well as Wobbe index
CWD PLUS
Continuous, highly accurate determination of the Wobbe index
CWD DPC
for use in accordance with Class I Division 2, Groups B, C, D, T4
CWD SPC
Reliable, reproducible measured values in real time for optimum monitoring
CWD EXP
Safe shutdown with changing gas composition Gas composition
CWD HT
The new CWD for precise measured values in the high temperature range
Industry applications
These products can be used in the following sectors.
Iron and steel production
Our appliance series have been used in iron and steel production for many decades.
Biogas
Union Instruments products have proven themselves extensively in biogas upgrading plants.
Petrochemicals and refineries
We produce customized and flexible measurement technology solutions for the petrochemical industry and refineries.
Glass and ceramics
Perfectly coordinated appliance technology for glass and ceramic applications that works both safely and economically.
Natural gas
Our INCA multi-gas analyzers provide efficient solutions for processes in natural gas plants.
Generating energy from waste
Our appliance technology makes an important contribution to the functionality of environmentally friendly and energy-saving system concepts.
Service
We clarify administrative and commercial issues for you.
+49 721 680381-30
Support
You can open a support ticket for technical support for your product.
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Distribution
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+49 721 680381-20
Downloads
Here you will find various downloads to support you.
Brochures, data sheets and application reports – we have all the relevant information for you here.
Industries
Our key application areas at a glance.
We supply a wide range of industrial plants such as steel production, the natural gas industry and biogas producers.
Products
Special products for your industrial application.
Our range includes the INCA, CWD and SIRA product series and the CAM module – combined with top advice and service.